That Ackermann is actually backwards. The inside wheel will turn less than the outside wheel in a turn, which is unrealistic and maybe it will affect the performance of the vehicle too. I'd go with "rectangle" geometry.

I'm still waiting for the new motors (DHL is fooling around with the local post office, so I have to call them again tomorrow). In the meantime I have improved the sturdy Scania significantly which is why I'm making building instructions. It might not survive a prolonged game of chicken, but it is one of the sturdiest trucks I have ever built.

Now with this new improved Scania R-series done, I want to update the orange truck so it has all the improvements as well.

I have updated the frame as follows:

The improvements include:
- XL motor for added torque (vs L-motor for speed)
- The new Ackermann steering geometry.
- Rear differential (vs the simple LSD from the previous version)
- More stable frame and sides.
- Downgearing on the release mechanism with a 1:3 gearing for smoother operation.
- New simpler and more stable stairs.

Now with this new improved Scania R-series done, I want to update the orange truck so it has all the improvements as well.

I have updated the frame as follows:

The improvements include:
- XL motor for added torque (vs L-motor for speed)
- The new Ackermann steering geometry.
- Rear differential (vs the simple LSD from the previous version)
- More stable frame and sides.
- Downgearing on the release mechanism with a 1:3 gearing for smoother operation.
- New simpler and more stable stairs.

I think the video Alasdair sent is good introduction to the concept of limited slip differential (LSD) but as far as I can see, it doesn't really tell how LSD was used in Lasse's truck. In Lasse's truck, LSD was basically used instead of differential to do the same thing: to allow wheels to turn at different rates. The easiest way to see the difference is to compare this step from previous truck (Scania Highline) to this step of the new truck. In the previous truck, the axle was set up so that the wheel on the left side was directly connected to the axle but wheel on the right side was connected via friction pin with bush in the end. In this way, when the axle turns, it forces the left wheel to follow the axle movement but the right wheel can slip a bit from the movement. Hence, it's limited slip differential.

Hopefully this explains it. If you still don't get the idea, try it with real bricks and you will notice what I meant, hopefully.

> olaf9198
I'm keeping the frame, fuel tanks, rear lights and wheels as generic as possible. This makes it easier to build other trucks without having to make large modifications to these parts. My experience tells me that making these parts detailed results in a weaker construction which makes the truck less fun to play with.
However, I still encourage people to build as detailed as possible.

Meanwhile I have completed roughly 90% of the new Highline. I still have to make a new rubber belt and the front has to be prepared for PF lights.

Yes. That's what I'm trying to do. By making frames which are nearly standardized, it should be easy for people to get started with their own truck designs. This way they don't have to worry too much about constructing robust frames.

I have just completed the MLCad model, so now it's onto constructing the building instructions.

Now. With both a low-line and a highline Scania R-series, the natural extension is to build a topline and thus give a major overhaul to my first truck with instructions.
This is how far I got with the detailing the first night. I'm still making adjustments here and there.